摘要
宁波舟山港主通道舟岱大桥70m跨非通航孔桥长12.32km,上部结构为预应力混凝土箱梁,下部结构为预制空心薄壁墩、现浇承台、钢管桩基础。预制墩采用C45海工混凝土,高11.29~49.67m,根据桥面高程不同,墩身分为4类整体或分节预制,共694个节段。墩身预制施工中,墩身外模采用液压自动开合模板;墩身标准截面的水平钢筋网片采用机器人焊接;墩身钢筋骨架采用水平匹配绑扎和竖转翻身吊装对接技术;分节墩身交接面采用高精度专用模板匹配压模施工技术。墩身与承台连接时,墩身与承台之间采用橡胶防水带+环氧砂浆封闭的止水方案;墩身内腔混凝土分2层浇筑,并优化混凝土配合比;墩身节段间采用自锁式预应力连接技术。
The Zhoudai Bridge carries part of the Ningbo-Zhoushan Main Channel,the non-navigational channel bridge of which measures 12.32 km,consisting of multiple 70 m-long spans.The superstructure comprises prestressed concrete box girders,below which are the precast hollow thin-walled piers,cast-in-situ pile caps and steel pile foundations.The precast piers are made of C45 marine concrete,measuring 11.29-49.67 m in height.To suit the deck elevation,the pier shafts were classified into four groups for either integral or segmental prefabrication.A total of 694 segments were prefabricated.The hydraulic formworks that open and close automatically were used as the external formwork in the prefabrication of pier shafts.The horizontal reinforced mesh on the typical cross-section of the piers was welded by robots.The reinforced skeleton inside the pier shaft took shape through horizontal matching and banding,and then,vertically turned over and hoisted and joined with the one that had already in place.For the segmental piers,the joint surface of the pier shaft was treated by using the high-precision specialized formwork with die casting technique.Gaps between the pier shaft and pile cap were wrapped with rubber waterproof tape and filled with epoxy mortar to be tightly sealed.The inner cells of the pier shaft were filled with concrete that was poured in two layers.The mix proportion of the concrete was optimized and the pier shaft segments were connected by the self-locking connection technique.
作者
张兴志
朴泷
余允锋
方明山
ZHANG Xing-zhi;PIAO Long;YU Yun-feng;FANG Ming-shan(Zhejiang Hang-Shao-Yong Expressway Co.,Ltd.,Hangzhou 311215,China;China Railway Major Bridge Engineering Group Co.,Ltd.,Wuhan 430050,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2020年第5期113-118,共6页
Bridge Construction
基金
浙江省交通运输厅科技计划项目(2018035)。
关键词
跨海大桥
预制空心薄壁墩
预制施工
自动开合模板
焊接机器人
填芯混凝土浇筑
自锁式预应力
施工技术
sea-crossing bridge
precast hollow thin-walled pier
prefabrication construction
formwork capable of automatic opening and closing
welding robot
casting core-filling concrete
self-locking prestressing
construction technique
